EP2302969A1 - Verfahren zur Handhabung der Mobilität in einem Multimedia-Broadcast-Multicast-Dienst-Monofrequenznetzwerk in einem drahtlosen Kommunikationssystem und zugehörige Kommunikationsvorrichtung - Google Patents

Verfahren zur Handhabung der Mobilität in einem Multimedia-Broadcast-Multicast-Dienst-Monofrequenznetzwerk in einem drahtlosen Kommunikationssystem und zugehörige Kommunikationsvorrichtung Download PDF

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Publication number
EP2302969A1
EP2302969A1 EP10011202A EP10011202A EP2302969A1 EP 2302969 A1 EP2302969 A1 EP 2302969A1 EP 10011202 A EP10011202 A EP 10011202A EP 10011202 A EP10011202 A EP 10011202A EP 2302969 A1 EP2302969 A1 EP 2302969A1
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EP
European Patent Office
Prior art keywords
mbsfn
mbms service
mbsfn area
target
service
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Granted
Application number
EP10011202A
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English (en)
French (fr)
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EP2302969B1 (de
Inventor
Chia-Chun Hsu
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HTC Corp
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HTC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to a method of handling mobility in multimedia broadcast multicast service single frequency network (MBSFN) in a wireless communication system and related communication device.
  • MMSFN multimedia broadcast multicast service single frequency network
  • LTE long-term evolution
  • 3GPP third generation partnership project
  • E-UTRAN evolved universal terrestrial radio access network
  • eNBs evolved Node-Bs
  • UEs user equipments
  • the LTE protocol stack can be segmented into access stratum (AS) layer and non-access stratum (NAS) layer.
  • AS access stratum
  • NAS non-access stratum
  • the AS layer includes sublayers as Layer 3, also known as the Radio Resource Control (RRC) layer, Layer 2, consisting of three sub-layers that are the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Medium Access Control (MAC) layer, and Layer 1, also known as the Physical (PHY) layer.
  • RRC Radio Resource Control
  • Layer 2 consisting of three sub-layers that are the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Medium Access Control (MAC) layer, and Layer 1, also known as the Physical (PHY) layer.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • Carrier aggregation where two or more component carriers are aggregated, is introduced into the LTE-Advanced system in order to support wider transmission bandwidths, e.g. up to 100MHz and for spectrum aggregation.
  • a UE of the LTE-Advanced system can simultaneously receive and/or transmit on multiple component carriers.
  • Carrier aggregation allows a UE to aggregate a different number of component carriers of possibly different bandwidths in uplink and downlink.
  • Evolved multimedia broadcast multicast service has been introduced in the LTE specification to broadcast or multicast TV, films, information such as free overnight transmission of newspaper in a digital form.
  • Two important scenarios have identified for the E-MBMS: one is single-cell broadcast, and the other is MBMS single frequency network (MBSFN).
  • MBSFN is a simulcast transmission technique that realizes transmission of identical waveforms at the same time from multiple cells. Since the MBSFN transmissions from the multiple cells are closely time-synchronized, the MBSFN transmission arrived at the UE is regarded as a transmission from a single cell and the UE may treat the MBSFN transmission in the same way as multi-path components of a single cell transmission without additional complexity.
  • An eNB belongs to only one MBSFN area and there is no overlapping between different MBSFN areas.
  • a downlink transport channel is required to be broadcasted in the entire coverage area of each cell in the MBSFN area, which is called a multicast channel (MCH).
  • the MAC layer of the LTE system offers data transfer services between the MCH and logical channels including a multicast traffic channel (MTCH) and a multicast control channel (MCCH), which are point-to-multipoint channels for transmitting traffic data and control information.
  • An MCCH is utilized for each MBSFN area and carries a message which lists all the MBMS services with ongoing sessions, transmitted by all cells within a corresponding MBSFN area except the reserved cell which does not contribute to the MBSFN transmission.
  • MCCH change notification is done by an MBMS radio network temporary identifier (M-RNTI) on the physical downlink control channel (PDCCH).
  • M-RNTI radio network temporary identifier
  • the E-UTRAN For network controlled mobility in the RRC_CONNECTED mode, the E-UTRAN triggers a handover procedure based on radio conditions and load, and thereby decides which cell a UE should hand over to in order to maintain the radio link.
  • the source eNB (which controls the source cell) requests the target eNB to prepare for the handover and the target eNB subsequently generates a handover message to order the UE to perform the handover.
  • the UE After receiving the handover message, the UE attempts to access the target cell according to a random access resource selection procedure, and upon successful completion of the handover, the UE sends a message to confirm the handover.
  • UEs that are receiving MBMS services in the RRC_IDLE mode performing cell reselection or are in the RRC_CONNECTED mode can obtain target cell MTCH information from the MCCH of the target cell.
  • mechanisms to deliver MCCH to UEs via a handover message are not supported. No new information is provided to help a UE in switching MBMS reception between MBSFN areas.
  • an eNB may be associated with multiple MBSFN areas, which results in impact on UE mobility in MBSFN, including the mechanism of MCCH change notification and MBMS service continuity.
  • the present invention aims at providing a method of handling mobility in MBSFN in a wireless communication system and related communication device, for improving MBMS service continuity.
  • the claimed method of handling mobility in MBSFN for a UE of a wireless communication system comprises when the UE proceeds with an MBMS service and performs handover from a source cell to a target cell, checking whether a target MBSFN area which the target cell belongs to is the same as a source MBSFN area which the source cell belongs to; when the target MBSFN area is different from the source MBSFN area, receiving an MCCH corresponding to the target MBSFN area; checking whether the MBMS service is provided in the target MBSFN area; and when the MBMS service is provided in the target MBSFN area, sending a service join request to a target network of the wireless communication system, for continuing to receive the MBMS service.
  • the wireless communication system 10 is composed of a network and a plurality of mobile devices.
  • the wireless communication system 10 can be an LTE system, an LTE-advanced system, or any other similar network system supporting evolved multimedia broadcast multicast service (E-MBMS).
  • E-MBMS evolved multimedia broadcast multicast service
  • the network can be referred as an E-UTRAN comprising a plurality of eNBs, and the mobile devices are referred as UEs.
  • Each eNB is able to communicate with an MBMS content provider to receive MBMS data.
  • the UEs can be devices such as mobile phones, computer systems, etc.
  • the network and the UE may be seen as a transmitter or receiver according to transmission direction, e.g. for uplink, the UE is the transmitter and the network is the receiver, and for downlink, the network is the transmitter and the UE is the receiver.
  • the communication device 20 can be the network or the UE shown in FIG. 1 and may include a processing means 200 such as a microprocessor or ASIC, a memory unit 210, and a communication interfacing unit 220.
  • the memory unit 210 may be any data storage device that can store program code 214 for access by the processing means 200. Examples of the memory unit 210 include but are not limited to a subscriber identity module (SIM), read-only memory (ROM), flash memory, random-access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device.
  • SIM subscriber identity module
  • ROM read-only memory
  • flash memory random-access memory
  • CD-ROM compact disc-read-only memory
  • magnetic tape magnetic tape
  • floppy disk and optical data storage device.
  • optical data storage device optical data storage device.
  • the communication interfacing unit 220 is preferably a radio transceiver for wirelessly communicating according to processing results of the processing means 200.
  • FIG. 3 is a flowchart of an exemplary process 30.
  • the process 30 is utilized for handling mobility in multimedia broadcast multicast service single frequency network (MBSFN) for a network of the wireless communication system 10.
  • MMSFN multimedia broadcast multicast service single frequency network
  • the process 30 can be compiled into the program code 214.
  • the process 30 includes the following steps:
  • the process 30 is performed by a target eNB, which is the eNB controlling a target cell a UE hands over to.
  • the target eNB upon handover, the target eNB generates a handover message including at least an MBSFN area identification (ID) corresponding to at least an MBSFN area which the target cell belongs to, and transmits the handover message to the UE. Therefore, the UE knows the MBSFN areas to receive MBMS services after handover.
  • ID MBSFN area identification
  • the eNB when generating the handover message, includes not only the MBSFN area IDs but also information of multicast control channels (MCCHs) corresponding to the MBSFN areas in the handover message.
  • MCCHs multicast control channels
  • FIG. 4 is a flowchart of an exemplary process 40.
  • the process 40 is utilized for handling mobility in MBSFN for a UE of the wireless communication system 10.
  • the process 40 can be compiled into the program code 214.
  • the process 40 includes the following steps:
  • the UE performing the process 40 may cooperate with the eNB which performs the process 30 and belongs to only one MBSFN area in order to receive the handover message including information of the MCCH corresponding to the target MBSFN area which the target cell belongs to.
  • Step 402 when the UE proceeds with a subscribed MBMS service and performs handover from a source cell to a target cell, the UE checks whether the target MBSFN area is the same as a source MBSFN area which the source cell belongs to, i.e. the UE checks whether the UE performs handover to the cell belonging to the same MBSFN area, and then performs Step 404 or Step 406 accordingly.
  • Step 404 when the target MBSFN area and the source MBSFN area are the same, the UE automatically continues to receive the MBMS service since the MBMS service is still provided.
  • Step 406 when the target MBSFN area is different from the source MBSFN area, the UE receives an MCCH corresponding to the target MBSFN area and according to Step 408, the UE checks whether the MBMS service is provided in the target MBSFN area.
  • the UE knows that the subscribed MBMS service is also provided in the target MBSFN area, the UE sends a service join request to a target eNB, which controls the target cell, for continuing to receive the subscribed MBMS service.
  • the subscription of the MBMS service can be manually or automatically controlled by a higher layer of the UE, e.g. Non-Access Stratum (NAS) layer.
  • NAS Non-Access Stratum
  • the UE terminates the process 40. Through the process 40, the UE smoothly continues to receive the subscribed MBMS service after handover and the UE mobility in MBSFN is improved.
  • FIG. 5 is a flowchart of an exemplary process 50.
  • the process 50 is utilized for handling mobility in MBSFN for a UE of the wireless communication system 10.
  • the UE performing the process 50 may subscribe to MBMS services in more than one MBSFN area and may cooperate with the eNB which performs the process 30 and belongs to more than one MBSFN area.
  • the process 50 can be compiled into the program code 214.
  • the process 50 includes the following steps:
  • Step 502 when the UE proceeds with a subscribed MBMS service S1 provided in an MBSFN area Ax and performs handover from a source cell to a target cell, the UE checks whether the MBSFN area Ax is included in MBSFN areas A1-AN the target cell belongs to, and performs Step 504 or Step 506 accordingly.
  • Step 504 the UE automatically continues to receive the MBMS service S1 under the MBSFN area Ax.
  • the UE receives N MCCHs corresponding to the MBSFN areas A1-AN and checks whether the MBMS service S1 is provided in at least one of the MBSFN areas A1-AN according to the received MCCHs because the MBMS service S1 may also be provided in MBSFN areas besides the MBSFN area Ax.
  • Step 512 the UE directly sends a service join request to a target eNB for continuing to receive the MBMS service S1.
  • the UE selects an MBSFN area from the MBMS areas providing the MBMS service S1 and sends the service join request to the target eNB for continuing to receive the MBMS service S1.
  • the UE selects the MBSFN area Ay prior to other MBSFN areas which also provides the MBMS service S2, to receive the MBMS service S2.
  • the UE selects the same MBSFN area to receive the desired MBMS service.
  • FIG. 6 is a flowchart of an exemplary process 60.
  • the process 60 is utilized for handling mobility in MBSFN for the network of the wireless communication system 10.
  • the process 60 can be compiled into the program code 214.
  • the process 60 includes the following steps:
  • the process 60 is utilized for the eNB to inform the MBMS content provider of the MBMS service unsubscription.
  • the eNB informs the MBMS content provider which provides the MBMS service the UE has unsubscribed to the MBMS service.
  • the MBMS content provider is informed of the unsubscription and unnecessary transmissions between the MBMS content provider and the eNB are saved.
  • FIG. 7 is a flowchart of an exemplary process 70.
  • the process 70 is utilized for handling mobility in MBSFN for the network of the wireless communication system 10.
  • the process 70 can be compiled into the program code 214.
  • the process 70 includes the following steps:
  • the eNB transmits an MCCH change notification including an MBSFN area ID corresponding to the MCCH, e.g. an MBMS radio network temporary identifier (M-RNTI), for informing a UE the MCCH is changed.
  • M-RNTI MBMS radio network temporary identifier
  • FIG. 8 is a flowchart of an exemplary process 80.
  • the process 80 is utilized for handling mobility in MBSFN for a UE of the wireless communication system 10.
  • the process 80 can be compiled into the program code 214.
  • the process 80 includes the following steps:
  • the UE performing the process 80 may cooperate with the eNB performing the process 70.
  • Step 802 when the UE receives an MCCH change notification, e.g. M-RNTI on the PDCCH, the UE checks whether an MBSFN area ID corresponding to an MBSFN area in which a subscribed MBMS service is provided (which is called a subscribed MBSFN area, in short) is included in the MCCH change notification. In other words, the UE checks whether the subscribed MBMS service is changed.
  • the UE When the MBSFN area ID corresponding to the subscribed MBSFN area is included in the MCCH change notification, the UE receives an MCCH corresponding to the subscribed MBSFN area in a next MCCH modification period so as to know updated information of the subscribed MBMS service. Otherwise, when the MBSFN area ID is not included in the MCCH change notification, the UE terminates the process 80 and thereby avoids unnecessary wakeup.
  • steps of the process 30, 40, 50, 60, 70 or 80 including suggested steps can be realized by means that could be hardware, firmware known as a combination of a hardware device and computer instructions and data that reside as read-only software on the hardware device, or an electronic system.
  • hardware can include analog, digital and mixed circuits known as microcircuit, microchip, or silicon chip.
  • the electronic system can include system on chip (SOC), system in package (Sip), computer on module (COM), and the communication device 20.
  • SOC system on chip
  • Sip system in package
  • COM computer on module
  • UE mobility is clearly defined for the conditions when UE performs handover under the eNB belonging to one or multiple MBSFN areas and when MBMS services are changed, and therefore MBMS service continuity is improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP10011202A 2009-09-28 2010-09-28 Verfahren zur Handhabung der Mobilität in einem Multimedia-Broadcast-Multicast-Dienst-Monofrequenznetzwerk in einem drahtlosen Kommunikationssystem und zugehörige Kommunikationsvorrichtung Not-in-force EP2302969B1 (de)

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US24616009P 2009-09-28 2009-09-28

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TW201129154A (en) 2011-08-16
US8254932B2 (en) 2012-08-28
EP2302969B1 (de) 2012-05-23
CN102036180A (zh) 2011-04-27
CN102036180B (zh) 2013-07-24
TWI411327B (zh) 2013-10-01
US20110077006A1 (en) 2011-03-31

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